After setting up my new (I had only gotten it two days ago, flashed LEDE just yesterday, and finished installing luci today, after returning from work) DM200-EUS, I had decided to disable IPv6, since it still isn't supported by my ISP (or any of the other ISPs in my country), and I still don't have enough time to start using it.
However, while applying the settings, the system had apparently froze, so I turned off the modem (since I am used to OEM firmware, as well as Padavan (on my Xiaomi Mi 3 Router) simply not applying the settings in such a case), and now I cannot connect to my modem at all via Ethernet, not in the regular mode, not in failsafe mode, and not in the bootloader mode.
Does anyone have any idea whether I had bricked my modem, and whether I can unbrick it without a serial cable (I'm sorry for the noob question, this is my first bricked modem/router, I am more used to unbricking Android devices (even hard bricked ones)).